
CHAPTER 4 PORT FUNCTIONS
User’s Manual U15905EJ2V1UD
145
(3) Block diagram
Figure 4-24. Block Diagram of PCD1 to PCD3
Internal
bus
WRPM
RD
Address
WRPORT
PCD1 to PCD3
PMCDn
Output latch
(PCDn)
PMCD
PCD
Selector
Remarks 1. PCD:
Port register CD
PMCD: Port mode register CD
2. n = 1 to 3